/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/


new Promise((resolve, reject) => {
    resolve('hello ')
}).then(value => {
  return value + 'lagou '
}).then(value => {
  var c = 'I ♥ U'
  console.log(value + c) 
})

let promise = new Promise((resolve, reject) => {
  resolve('hello ')
})
let p2 = promise.then(value => {
  return value + 'lagou '
})
p2.then(value => {
  console.log(value + 'I ♥ U')
})